Query Service help experts!!

I am developing an application for Windows 2000 NTFS file systems using VC++ MFC version 6.0. I need to query whether "Norton antivirus" is installed on a system or not.

We know that Norton Antivirus runs as a service. So to find its existence I suppose, I should query whether the service for norton exists of not in the system. So my query is that
"Is there any API provided to know existence of a service given its name. (in this case, navapscv is the name of the service, also we know its rest of parameters like display name,etc)"

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